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Which current is helpful in detecting sub surface discontinuities?

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in Casting-Forming-Welding II by (119k points)
Which current is helpful in detecting sub surface discontinuities?

(a) High frequency AC

(b) Low frequency AC

(c) Full wave DC

(d) Half wave DC

The question was asked in exam.

This is a very interesting question from Magnaflux Test in division Non Destructive Techniques of Casting-Forming-Welding II

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Best answer
The correct answer is (c) Full wave DC

Explanation: None.

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